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Group lot of four items signed by one or more notable astronomers: Clyde W. Tombaugh and James W. Christy (book photo), Bart Bok (sketch, ins), Nicholas U. Mayall (sketch), and Fred Lawrence Whipple (article). In overall fine condition. Accompanied by an original mailing envelope, with the return address field incorporating Christy's signature.
Clyde W. Tombaugh (1906–1997), American astronomer who discovered Pluto in 1930.
James W. Christy (born 1938), American astronomer known for discovering Charon, the largest moon of the dwarf planet Pluto.
Bart Bok (1906–1983), Dutch-American astronomer known for his work on the structure and evolution of the Milky Way galaxy and the discovery of Bok globules.
Nicholas U. Mayall (1906–1993), American astronomer who contributed to astronomical knowledge of nebulae, supernovae, spiral galaxy internal motions, the redshifts of galaxies, and the origin, age, and size of the Universe.
Fred Lawrence Whipple (1906–2004), American astronomer, who worked at the Harvard College Observatory for more than 70 years; his achievements include asteroid and comet discoveries, the ‘dirty snowball’ hypothesis of comets, and the invention of the Whipple shield.
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